224 
THE VOYAGE OF H.M.S. CHALLENGEB. 
The arched chambers of which the shell is composed are individually divided by vertical 
secondary septa into a single row of chamberlets, each of which has a simple orifice. 
There is no further subdivision of the chamber-cavities by horizontal partitions, as in the 
fusiform and sub cylindrical varieties with which the species is commonly found associated. 
Eecent specimens of Alveolina melo have been found amongst the coral-sands of the 
West Indies, Bermuda, Cape de Verde Islands, Ascension Island, the Gulf of Suez, 
Mauritius, Ceylon, and the Sandwich Islands, but in no case at greater depth than 40 
fathoms. The shells, as a rule, are of much smaller dimensions than those met with 
in the fossil condition, and seldom exceed yVth inch (075 mm.) in longer diameter. The 
specimen figured by Ehrenberg (Joe. cit.) is from the Karst, near Triest, on the shores of 
the Adriatic, but whether recent or fossil is not stated by the author. 
In determining the geological distribution, it is not easy to separate Alveolina melo 
from the allied Alveolina ovoidea and Alveolina elliptica ; but its occurrence in the 
Nummulitic limestones of Hungary and Transylvania is attested by various authors, and 
its presence in the Eocene of the neighbourhood of Montolieux and Couiza (France) and 
the Miocene of Nussdorf near Vienna, is recorded by d’Orbigny. 
Sub-family 6. Keramospheeringe. 
Keramosphcera, H. B. Brady. 
Keramosphcera, Brady [1882]. 
Test free, spherical ; composed of a multitude of chamberlets arranged more or less 
regularly in concentric layers. 
This genus comprises only a single species. 
Keramosphcera murrayi, H. B. Brady. 
Keramosphcera murrayi, Brady, 1882, Ann. and Mag. Nat. Hist., ser. 5, vol. x. p. 242, pi. xiii. 
Test free, porcellanous, spherical ; formed of concentric layers, each consisting of a 
large number of chamberlets arranged more or less regularly in single series. Chamberlets 
of the same layer communicating with each other by short lateral stolons ; those of the 
successive layers by the pores which formed the superficial apertures of the previous layer. 
Aperture consisting of numerous pores, one at the margin of each chamberlet. Colour 
white ; surface areolated by the irregular outlines of the somewhat convex chamberlets 
of the peripheral layer. Diameter, about ^th inch (2 '5 mm.). 
Only two specimens of this interesting type have hitherto been found, and both in 
